I would suggest looking into finding a few examples of an 01 GP 3.1L swapping to an L67, that should give you most of the wiring info and what adapters/hardware you'll need to procure. You'll also need a tuner that can change VIN numbers, because you might need to use a different PCM than the original Aztec PCM.

Second, I would look for an AWD Aztec. If she ends up not liking it after all, you can put some bigger tires on it and go offroading in a Pontiac. lol